Have you ever had a 60 day strain take an extra 3 or 4 weeks to finish
Yes.
You see. Your environment is different then the breeders environment. Differing enviro's greatly effect growth of strains in many ways.
In fact. I have seen people ask if the plant "shift's genetically" as you successively clone it. Because it changed the way it looked and grew.
Like it got taller and took longer.
This is NOT a genetic shift!
It is an environmental shift.
The plant is now growing to more of the type of strain that grows better in your environment. For the strains involved in the cross used to make the strain your growing.
Example would be like it does the taller and longer thing. It is growing to more of the Sativa side. My bet would be you have warmer and more humid conditions then the breeder..Not to forget that lighting, what you feed, how much you feed and how you feed it....Are also environmental conditions. There are more conditions then most people think..
So yes. I myself have, had those things happen to me....
I should point out that your concentration potentials do NOT change.... You still have every chance of making the plant do the same THC/CBD and Terp as the breeder. Maybe even better, if he didn't hit the best the potentials could have been....Rare but happens.
w this occurs on the molecular level. Sorry for potato pics
